SharpDevelop/samples/EmbeddedImageAddIn/ImageCache.cs at master · icsharpcode/SharpDevelop · GitHub

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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)

// This code is distributed under MIT X11 license (for details please see \doc\license.txt)

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using ICSharpCode.Core;

namespace EmbeddedImageAddIn

{

public static class ImageCache

{

static readonly Dictionary<FileName, WeakReference> imageCache = new Dictionary<FileName, WeakReference>();

public static ImageSource GetImage(FileName fileName)

{

lock (imageCache) {

WeakReference wr;

ImageSource image;

// retrieve image from cache, if possible

if (imageCache.TryGetValue(fileName, out wr)) {

image = (ImageSource)wr.Target;

if (image != null)

return image;

}

// load image:

image = LoadBitmap(fileName);

if (image != null)

imageCache[fileName] = new WeakReference(image);

// clean up cache:

List<FileName> entriesToRemove = (from p in imageCache where !p.Value.IsAlive select p.Key).ToList();

foreach (var entry in entriesToRemove)

imageCache.Remove(entry);

return image;

}

static BitmapImage LoadBitmap(string fileName)

{

try {

if (File.Exists(fileName)) {

BitmapImage bitmap = new BitmapImage(new Uri(fileName));

bitmap.Freeze();

return bitmap;

}

} catch (ArgumentException) {

// invalid filename syntax

} catch (IOException) {

// other IO error

}

return null;

}

SharpDevelop/samples/EmbeddedImageAddIn/ImageCache.cs at master · icsharpcode/SharpDevelop · GitHub

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